Glue has a Software Development Kit (SDK) that is available for review at http://bim360.autodesk.com/api/doc/index.shtml.
Only subscribed users can obtain an API key.
Integration can be as simple as embedding the Glue 3D viewer into an application (think of embedding a YouTube video in a webpage) or as sophisticated as linking BIM data to project workflows. Integrations are built on the premise of linking, rather than moving data.